Commit 5369cc42 authored Mar 12, 2021 by Du Cheng Committed by Greg Kroah-Hartman Apr 07, 2021

drivers: video: fbcon: fix NULL dereference in fbcon_cursor()



commit 01faae5193d6190b7b3aa93dae43f514e866d652 upstream.

add null-check on function pointer before dereference on ops->cursor

Reported-by:  <syzbot+b67aaae8d3a927f68d20@syzkaller.appspotmail.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Du Cheng <ducheng2@gmail.com>
Link: https://lore.kernel.org/r/20210312081421.452405-1-ducheng2@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 7eb9eb82

drivers/video/fbdev/core/fbcon.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -1306,6 +1306,9 @@ static void fbcon_cursor(struct vc_data *vc, int mode)

		ops->cursor_flash = (mode == CM_ERASE) ? 0 : 1;

		if (!ops->cursor)
		return;

		ops->cursor(vc, info, mode, get_color(vc, info, c, 1),
		get_color(vc, info, c, 0));
		}